Callon was one of the Bannermen under Gavrok. In Wales in 1959, he and Arrex were assigned to guard Jerome Weismuller and Hawk, but they were freed by Ray. They later tried to kill the Chimeron princess but were disabled by her sonic abilities.
Arrex was killed but Callon got away and told the other Bannermen where she was. However, when they returned, they were attacked by Goronwy's bees. After they were defeated, Callon and the other Bannermen were taken prisoner by Delta and Billy. (TV: Delta and the Bannermen)